https://www.globalwitness.org/documents/20405/Hydrogen_is_too_expensive_-_September_2022.pdf
https://bfi.uchicago.edu/wp-content/uploads/2024/02/BFI_WP_2024-11.pdf
https://www.hamiltonproject.org/assets/files/Environmental_Facts_FINAL.pdf
https://publications.parliament.uk/pa/cm5801/cmselect/cmpubacc/405/405.pdf